Question

Wwhat happened when ironfillings is added with copper sulphate solution

Answer 1

When iron fillings are added to copper sulphate solution then displacement reaction takes place as iron is more reactive than copper so it displaces iron from salt solution.

Fe + cuso4 --- feso4 + cu

In this recation copper sulphate turns green in colour because iron ions dissolve in it and iron nails acquire a surface of Brown layer on it